268 FAUNA HAWAIIENSIS 



(27) Thriscotliorax robitstus, Blackburn. 



Cyclothorax robustus Blackburn, Ent. Mo. Mag. xvii. 1881, p. 228. 



This species is so closely similar to Mccyclothorax robustus as to suggest that the 

 two may be dimorphic forms of one species. We have only a small series of sixteen 

 examples; the locality numbers are 372, 599, 605, 620, 622, 679, 680, or almost the 

 same as for M. robustus. Mr Blackburn's type was the only example he found ; it is 

 very large, and feebly striate in comparison with the examples procured by Mr Perkins, 

 but as it may be the same species I adopt his name. 



Hab. Maui. Haleakala on several occasions at an elevation of 4000 or 5000 ft. 

 (Perkins). Blackburn found only one example ; it has a similar record. 



(28) Thriscothorax platysminus, sp. nov. 



Robustus, piceus, antennis, palpis jDedibusque testaceis ; prothorace lateribus sub- 

 curvatis, posterius leniter angustato, angulis posterioribus obtuse rectis ; elytris oblongis, 

 sat crasse marginatis, subtiliter striatis. Long. 5^^ mm. 



Plate VII. fig. 15. 



Antennae rather slender, entirely yellow. Thorax transverse, sides but little 

 rounded, narrowed a little behind the middle, with an almost imperceptible sinuation 

 before the hind angle, but enough to prevent this from being markedly obtuse ; median 

 channel distinct, anterior impression strigose, the base strigose, with but few punctures. 

 Elytra more oblong than usual, but little rounded at the shoulders ; with the full com- 

 plement of striae, but these fine, minutely punctate, extending from base to tip, but the 

 outer one or two very obsolete. Legs slender. Two specimens. 



Readily distinguished from T. robustus, by the scarcely at all metallic surface, less 

 convex form, and much finer striation of the elytra. 



Hab. Molokai. About 4000 ft., jarobably on the side of a stream at the bottom of 

 the gulch, June 1896 (Perkins). 



(29) Thriscothorax argutor, sp. nov. 



Augustus, subparallelus, rufus, politus, antennis, palpis i^edibusque flavis ; prothorace 

 subquadrato, basin versus leniter angustato et sinuato, angulis posterioribus rectis ; 

 elytris suboblongis, sat profunde punctato-striatis. Long. 5 mm. 



Antennae long, head rather narrow. Thorax not much narrower than the elytra, 

 broader than long in the proportion of about five to four, the sides slightly rounded, 

 distinctly narrowed and sinuate behind, the hind angles rectangular ; the anterior im- 

 pression distinct, but with many strigosities about it, the median channel distinct and 

 carried to the base, the lateral margin fine in front, but more elevated behind, and at 

 the hind angles strongly elevated, the base but little punctate. Elytra rather long and 



